Be more strict about not corrupting stdout
Required by !462 (merged).
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graphics-drivers: Capture stdout/stderr from capsule-capture-libs
If we're running as part of a command whose stdout is machine-readable, such as a Meson TAP test suite, we don't want to corrupt stdout.
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tests: Redirect cheap-copy helper stdout to stderr
This prevents it from corrupting our machine-readable TAP output.
Edited by Simon McVittie